[PATCH] Add non-blocking Wait() for launched processes

[Tareq A. Siraj]

  Addressing review comments from @rafael.

Hi revane, chandlerc, Bigcheese,

http://llvm-reviews.chandlerc.com/D1728

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1728?vs=4428&id=4497#toc

Files:
  include/llvm/Support/Program.h
  lib/Support/Program.cpp
  lib/Support/Unix/Program.inc
  lib/Support/Windows/Program.inc
  unittests/Support/ProgramTest.cpp
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